this is in a louisiana bayou. this video shot by local officials. this morning, we're told the sinkhole is still active and growing. right now, there's no homes in danger. but i looked this up. 25 acres in size right now. it's been growing for more than a year. it was a collapsed salt dome. a growing problem. >> really scary. >>> we're going to turn to the latest on the health scare for vice president joe biden's son, beau. he is said to be in great shape and expected to be discharged today from a houston cancer hospital, after undergoing a procedure there earlier this week. doctors don't know what's exactly wrong with beau biden. but he was admitted after becoming weak and disoriented last week. abc's chief medical editor, dr. richard besser, here with us this morning. make it clear. you haven't seen the records here. you don't know exactly what is wrong. but first, treated for a stroke. and now, at a cancer center. what does it say to you? >> initially, when you hear someone has similymptoms that a like a stroke and they've had a stroke in the pas